January Weather in Petersburg, United States

Last updated: June 24, 2025

In January, the average temperature in Petersburg, United States hovers around 5°C (41°F). Expect chilly nights with minimums plummeting to -15°C (5°F), while days can warm up to a pleasant 26°C (78°F). With an average precipitation of 18 mm (0.7 in) over just 3 days, staying dry can be a challenge. Completing the climate picture is a notable average humidity of 75%, ensuring a crisp, refreshing air throughout the month.

January Temperature in Petersburg

In January in Petersburg, the average temperature is 5°C (41°F). Maximums can reach 26°C (78°F), while minimums can plummet to -15°C (5°F). Be sure to pack layered clothing to accommodate the wide temperature range during your travels.

January Weather in Petersburg: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Petersburg, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Petersburg, January typically has an average temperature of 5°C (41°F), with highs reaching up to 26°C (78°F) and lows dropping to around -15°C (5°F).

Data source: Temperature data for Petersburg generated using information from the Copernicus Climate Change Service.

January Precipitation in Petersburg

In Petersburg in January, the precipitation amount is 18 mm (0.7 in) over a span of 3 days.

January Precipitation Trends in Petersburg

The chart displays monthly precipitation patterns in Petersburg, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Petersburg, January typically receives around 18 mm (0.7 inches) of precipitation spread over approximately 3 days.

Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

January Humidity in Petersburg

In Petersburg in January, humidity is 75%. With an average temperature of 5°C (41°F), this humidity feels like a damp chill that seeps into your bones, making outdoor exploration less inviting and requiring extra layers for comfort while traveling.

January Average Humidity in Petersburg

This chart illustrates the average monthly humidity levels in Petersburg, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Petersburg is approximately 75%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Petersburg

In Petersburg in January, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Petersburg.

Maximum UV Index Levels in Petersburg for January

The chart shows the monthly maximum UV Index (UVI) for Petersburg in January, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In January, the maximum UV index in Petersburg typically reaches 5, which falls under the moderate exposure category.

Data source: Petersburg January UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How January Weather in Petersburg Compares to Other Months

Weather in Petersburg varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Petersburg, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Petersburg, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	5°C (41°F)	18 mm (0.7 inches)	75%	moderate
February Weather	6°C (43°F)	13 mm (0.5 inches)	74%	high
March Weather	12°C (54°F)	48 mm (1.9 inches)	66%	very high
April Weather	16°C (60°F)	36 mm (1.4 inches)	70%	extreme
May Weather	21°C (71°F)	68 mm (2.7 inches)	75%	extreme
June Weather	26°C (78°F)	55 mm (2.2 inches)	79%	extreme
July Weather	27°C (81°F)	30 mm (1.2 inches)	78%	extreme
August Weather	27°C (80°F)	35 mm (1.4 inches)	71%	extreme
September Weather	23°C (74°F)	57 mm (2.3 inches)	69%	very high
October Weather	16°C (61°F)	46 mm (1.8 inches)	70%	very high
November Weather	10°C (51°F)	16 mm (0.6 inches)	82%	high
December Weather	7°C (44°F)	19 mm (0.7 inches)	82%	moderate